# Questions tagged [performance]

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### Grouping only overlapping points into stacks

I have n number of files on a ScrollView. Every time a file is added, x/y coordinates are stored in an array. The user is able to drag and drop the files anywhere they like. Overlapping files (e.g. ...
14 views

### How to draw a Markov chain model for this simulation

A node of a data communication network which can transmit data at 4 different rates r, 2r, 3r & 4r uses the mechanism described below to control congestion: At any given time the node is ...
1 vote
17 views

### Why does an N retries failure rate is $(1-x)^N$?

I read this blog post Fixing retries with token buckets and circuit breakers (by Marc Brooker), which goes through several retry strategies. For the "N retries" strategy (i.e. on failure, ...
1 vote
106 views

### Reasoning behind specifically doubling the array size upon reallocation

I am trying to understand the actual reasoning behind creating a new dynamic array of double the size of the original array once it gets full as opposed to any reasonably random number (not too small ...
28 views

### Determining runtime of a theoretical program (question of extraordinary complexity)?

I apologize in advance, as I don't have a clue to which stackexchange to post this question! I beg you to not delete this question, as I have chronic pain and it is very important to me!!! I actually ...
34 views

### What is the most performant and reliable algorithm to find all roots of a nonlinear function within a range?

Following this question on MATLAB's Discord channel, I did a bit of search and found this interesting answer using circshift() function to detect zero-crossings. I ...
1 vote
32 views

### CEK machine vs SECD machine

What are the differences between the CEK machine and the modern variant of the SECD machine (which combines stack and dump) from the point of view of performance, memory efficiency, and other factors? ...
20 views

### Is arithmetic/constants code optimization a function of the Language/Compiler/CPU/ALU/OS and what languages implement such features in itself?

Take the following case ...
1 vote
21 views

### (Branchless) Bitonic Sorting Network for a Set of Floating Point Numbers

In the past I've implemented a branchless Bitonic Sorting Network on a gpu using CUDA, for integers. I am facing a related problem: In my Order Independent Transparency implementation, I would like to ...
37 views

### Is there a way to convert FLOPS to bit operation per second

My problem is the following: I have $N$ inner products to compute in parallel every second. Each of the vectors in those inner product is composed of $7$ bits. I want to know for which $N$ it starts ...
55 views

### CPU utilization estimation

In the Modern Operating System by Andrew Tanenbaum, Herbert Bos the authors provide their explanation of the concept of CPU utilization in the following way: A better model is to look at CPU usage ...
1 vote
330 views

### What is the difference between FLOPS and OPS?

I have typically heard computer performance discussed in terms of FLOPS. However, I have recently seen multiple references instead using OPS i.e. operations per second, typically in the context of Big ...
59 views

### Confusion regarding calculation of estimated memory access time in a system containing only a cache and main memory for simplicity

Let us consider a system having cache and main memory. Now suppose we are asked to find the average memory access time. Let $h$ be the hit ratio for the cache, $t_c$ be the cache access time, $t_m$ be ...
1 vote
116 views

### Do more registers increase clock cycle time?

While reading a book on computer organization, I ran into a design principle stating that "smaller is faster", indicating that fewer registers means less clock cycle time. Could you prove ...
12 views

### Analysis of straggler in tree-based parallel execution

Does anyone have a reference on how tree-based parallel execution can reduce the chance of getting a straggler. Google Dremel and Jeff Dean's talk at slide 53 both talk about using tree-based parallel ...
51 views

### Distributed Algorithm to get an ordered list of nodes in a bipartite graph

Given a weighted bipartite graph with nodes of type A and B, I want to output an (approximately) ordered list of type B nodes as defined by the following heuristic: For each node of type B, sum over ...
37 views

### Minimum number of elements in AVL tree to make it worth creating

Given an AVL tree containing nodes ordered by unique integer I.D's and data as pointers to some struct, what would be the expected minimum number of elements that will justify the creation and ...
1 vote
155 views

### Fast computing of a matrix power for large integer values in C++

I'm working with squared matrices that can be quite large, for instance, a M = 50 x 50 matrix. My objective is to compute the power of the squared matrix ...
73 views

### How to detect when to use radix sort in runtime

I'm implementing a stable integer sorting algorithm, I've chosen radix sort. I've tested LSD vs MSD implementation, wrote MSD/LSD hybrid implementation to reduce bandwidth pressure. The repo is here: ...
1 vote
44 views

### The correct way to calculate the performance of my approximate algorithm

I've got a question about how best to classify the performance of an approximate algorithm. I'm trying to find the 'correct' value of a graph problem instance whose cost function has an objective ...
88 views

### Analyzing parallel performance question

I was reviewing for my CS class and came across this question and answer combo that didn't have any explanation why it was correct. I'm confused on how they got the answer: We have a system to which ...
66 views

### Interesting Speedup & Amdahl's law problem

I have found a problem on my Computer Architecture textbook which I have some issues with: We have a process which spends its time in the following way: 50% of the time, it executes common ...
702 views

### Metrics on which Clock Cycles Per Instruction(CPI) depends

In the book - Computer Organization and Design: The Hardware/Software Interface [RISC-V Edition] by Patterson and Hennessy, CPI is defined like this: The term clock cycles per instruction, which is ...
24 views

### Is it possible to generate a better random number generator algorithm from an algorithm that use N computers with one that uses N+1 computers?

Is it possible to generate a better random number generator algorithm from an algorithm that use N number of computers with an algorithm that uses N+1 number of computers? I use the word computer here,...
550 views

### Calculating CPU throughput on a single cycle vs multicycle datapath

When calculating the throughput of a CPU, how does it differ when it is implemented with a single cycle datapath versus a multicycle datapath? If for example the CPU is running 1 GHz freq, then ...
1 vote